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Preference Shares - Issued and Outstanding (Details) - CAD
CAD in Millions
Dec. 31, 2016
Dec. 31, 2015
Jun. 30, 2015
Class of Stock [Line Items]      
Preferred stock shares issued (shares) 66,200,000 74,194,000  
Preference stock issued CAD 1,623 CAD 1,820  
Preferred stock outstanding (shares) 66,200,000 74,194,000  
Preferred stock outstanding CAD 1,623 CAD 1,820  
Series E      
Class of Stock [Line Items]      
Preference stock shares issued (shares) 0 7,994,000  
Preference shares issued CAD 0 CAD 197  
Preference stock outstanding (shares) 0 7,994,000  
Preference stock outstanding CAD 0 CAD 197  
Series F      
Class of Stock [Line Items]      
Preferred stock shares issued (shares) 5,000,000 5,000,000  
Preference stock issued CAD 122 CAD 122  
Preferred stock outstanding (shares) 5,000,000 5,000,000  
Preferred stock outstanding CAD 122 CAD 122  
Series G      
Class of Stock [Line Items]      
Preferred stock shares issued (shares) 9,200,000 9,200,000  
Preference stock issued CAD 225 CAD 225  
Preferred stock outstanding (shares) 9,200,000 9,200,000  
Preferred stock outstanding CAD 225 CAD 225  
Series H      
Class of Stock [Line Items]      
Preferred stock shares issued (shares) 7,025,000 7,025,000 10,000,000
Preference stock issued CAD 172 CAD 172  
Preferred stock outstanding (shares) 7,025,000 7,025,000  
Preferred stock outstanding CAD 172 CAD 172  
Series I      
Class of Stock [Line Items]      
Preferred stock shares issued (shares) 2,975,000 2,975,000  
Preference stock issued CAD 73 CAD 73  
Preferred stock outstanding (shares) 2,975,000 2,975,000  
Preferred stock outstanding CAD 73 CAD 73  
Series J      
Class of Stock [Line Items]      
Preferred stock shares issued (shares) 8,000,000 8,000,000  
Preference stock issued CAD 196 CAD 196  
Preferred stock outstanding (shares) 8,000,000 8,000,000  
Preferred stock outstanding CAD 196 CAD 196  
Series K      
Class of Stock [Line Items]      
Preferred stock shares issued (shares) 10,000,000 10,000,000  
Preference stock issued CAD 244 CAD 244  
Preferred stock outstanding (shares) 10,000,000 10,000,000  
Preferred stock outstanding CAD 244 CAD 244  
Series M      
Class of Stock [Line Items]      
Preferred stock shares issued (shares) 24,000,000 24,000,000  
Preference stock issued CAD 591 CAD 591  
Preferred stock outstanding (shares) 24,000,000 24,000,000  
Preferred stock outstanding CAD 591 CAD 591